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• W2000727476 abstract "The relaxation rate of electronic magnons with wave vectors $stackrel{ensuremath{rightarrow}}{mathrm{k}}$ smaller than $0.03{k}_{mathrm{ZB}}$ has been measured as a function of temperature and $stackrel{ensuremath{rightarrow}}{mathrm{k}}$, using the technique of parallel pumping. The experiments utilized high magnetic fields to probe the region just below the antiferromagnetic spin-flop transition, which then involves magnons with microwave frequencies. The measured relaxation rates in the temperature range 1.4 to 10 K span the range ${10}^{5}$-${10}^{6}$ ${mathrm{sec}}^{ensuremath{-}1}$, and show two distinct temperature dependences. At lower temperatures a nearly linear $T$ dependence, and at higher ones a ${T}^{4}$ dependence, are observed. Magnon-relaxation calculations reveal that at lower temperatures the three-magnon dipole-dipole interaction is probably responsible for the damping, whereas four-magnon exchange and anisotropy interactions prevail at the higher ones, in satisfactory agreement with experiment. The latter result is in agreement with antiferromagnetic resonance measurements in Mn${mathrm{F}}_{2}$, which showed the linewidth to be accurately described by the four-magnon process for $T>5$ K." @default.
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• W2000727476 date "1980-04-01" @default.
• W2000727476 modified "2023-10-17" @default.
• W2000727476 title "Parallel-pumping studies of magnon damping in MnF2" @default.
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• W2000727476 doi "https://doi.org/10.1103/physrevb.21.3015" @default.
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